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Aligning on Polaris will not give a high standard of precision, as it is too far from the pole, but is good enough for casual visual purposes, an occasional
touch of a button being required in order to keep the object centred. It is not
worth the bother of using more accurate methods for visual work only.
If, for whatever reason, such as imaging, you need more accuracy, the
drift alignment method called D.A.R.V. is quicker and easier than
conventional drift aligning.[Google it[.
The only purpose that setting circles serve on a GoTo mount, is to aid in
locating an object with known R.A. and Dec. that is not in the mount's
database.
raymo
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